[PATCH 08/27] ext4: factor out ext4_do_fallocate()

Zhang Yi
2024-10-22T03:13:01Z

From: Zhang Yi <yi.zhang@huawei.com>

Now the real job of normal fallocate are open coded in ext4_fallocate(),
factor out a new helper ext4_do_fallocate() to do the real job, like
others functions (e.g. ext4_zero_range()) in ext4_fallocate() do, this
can make the code more clear, no functional changes.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
---
fs/ext4/extents.c | 125 ++++++++++++++++++++++------------------------
1 file changed, 60 insertions(+), 65 deletions(-)

diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 4e35c2415e9b..2f727104f53d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -4692,6 +4692,58 @@ static long ext4_zero_range(struct file *file, loff_t offset,
return ret;
}

+static long ext4_do_fallocate(struct file *file, loff_t offset,
+ loff_t len, int mode)
+{
+ struct inode *inode = file_inode(file);
+ loff_t end = offset + len;
+ loff_t new_size = 0;
+ ext4_lblk_t start_lblk, len_lblk;
+ int ret;
+
+ trace_ext4_fallocate_enter(inode, offset, len, mode);
+
+ start_lblk = offset >> inode->i_blkbits;
+ len_lblk = EXT4_MAX_BLOCKS(len, offset, inode->i_blkbits);
+
+ inode_lock(inode);
+
+ /* We only support preallocation for extent-based files only. */
+ if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
+ ret = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if (!(mode & FALLOC_FL_KEEP_SIZE) &&
+ (end > inode->i_size || end > EXT4_I(inode)->i_disksize)) {
+ new_size = end;
+ ret = inode_newsize_ok(inode, new_size);
+ if (ret)
+ goto out;
+ }
+
+ /* Wait all existing dio workers, newcomers will block on i_rwsem */
+ inode_dio_wait(inode);
+
+ ret = file_modified(file);
+ if (ret)
+ goto out;
+
+ ret = ext4_alloc_file_blocks(file, start_lblk, len_lblk, new_size,
+ EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT);
+ if (ret)
+ goto out;
+
+ if (file->f_flags & O_SYNC && EXT4_SB(inode->i_sb)->s_journal) {
+ ret = ext4_fc_commit(EXT4_SB(inode->i_sb)->s_journal,
+ EXT4_I(inode)->i_sync_tid);
+ }
+out:
+ inode_unlock(inode);
+ trace_ext4_fallocate_exit(inode, offset, len_lblk, ret);
+ return ret;
+}
+
/*
* preallocate space for a file. This implements ext4's fallocate file
* operation, which gets called from sys_fallocate system call.
@@ -4702,12 +4754,7 @@ static long ext4_zero_range(struct file *file, loff_t offset,
long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
{
struct inode *inode = file_inode(file);
- loff_t new_size = 0;
- unsigned int max_blocks;
- int ret = 0;
- int flags;
- ext4_lblk_t lblk;
- unsigned int blkbits = inode->i_blkbits;
+ int ret;

/*
* Encrypted inodes can't handle collapse range or insert
@@ -4729,71 +4776,19 @@ long ext4_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
ret = ext4_convert_inline_data(inode);
inode_unlock(inode);
if (ret)
- goto exit;
+ return ret;

- if (mode & FALLOC_FL_PUNCH_HOLE) {
+ if (mode & FALLOC_FL_PUNCH_HOLE)
ret = ext4_punch_hole(file, offset, len);
- goto exit;
- }
-
- if (mode & FALLOC_FL_COLLAPSE_RANGE) {
+ else if (mode & FALLOC_FL_COLLAPSE_RANGE)
ret = ext4_collapse_range(file, offset, len);
- goto exit;
- }
-
- if (mode & FALLOC_FL_INSERT_RANGE) {
+ else if (mode & FALLOC_FL_INSERT_RANGE)
ret = ext4_insert_range(file, offset, len);
- goto exit;
- }
-
- if (mode & FALLOC_FL_ZERO_RANGE) {
+ else if (mode & FALLOC_FL_ZERO_RANGE)
ret = ext4_zero_range(file, offset, len, mode);
- goto exit;
- }
- trace_ext4_fallocate_enter(inode, offset, len, mode);
- lblk = offset >> blkbits;
-
- max_blocks = EXT4_MAX_BLOCKS(len, offset, blkbits);
- flags = EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT;
-
- inode_lock(inode);
-
- /*
- * We only support preallocation for extent-based files only
- */
- if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
- ret = -EOPNOTSUPP;
- goto out;
- }
-
- if (!(mode & FALLOC_FL_KEEP_SIZE) &&
- (offset + len > inode->i_size ||
- offset + len > EXT4_I(inode)->i_disksize)) {
- new_size = offset + len;
- ret = inode_newsize_ok(inode, new_size);
- if (ret)
- goto out;
- }
-
- /* Wait all existing dio workers, newcomers will block on i_rwsem */
- inode_dio_wait(inode);
-
- ret = file_modified(file);
- if (ret)
- goto out;
-
- ret = ext4_alloc_file_blocks(file, lblk, max_blocks, new_size, flags);
- if (ret)
- goto out;
+ else
+ ret = ext4_do_fallocate(file, offset, len, mode);

- if (file->f_flags & O_SYNC && EXT4_SB(inode->i_sb)->s_journal) {
- ret = ext4_fc_commit(EXT4_SB(inode->i_sb)->s_journal,
- EXT4_I(inode)->i_sync_tid);
- }
-out:
- inode_unlock(inode);
- trace_ext4_fallocate_exit(inode, offset, max_blocks, ret);
-exit:
return ret;
}

--
2.46.1